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Re: Steel Water Sorage Tank- Foundation Settlement Criteria

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>Is there any design criteria/guideline for steel tank settlement ?
The corresponding loads probably fall into the category of support loads 
which are always a consideration. Check the AWWA spec for allowable 
stress levels. The real question is whether the movement reflects a local 
load or simply rigid body displacement of the tank as a whole without any 
elastic distortion. If the displacement is rigid body movement it won't 
necessarily hurt the tank, but it may load the connecting pipe. I'd check 
carefully to make sure that the pipes haven't deflected. 

I think I'd also check the foundation carefully for any indication that 
it's not undermined in some way that would cause rigid body movement. 
Radial cracks or strained anchor bolts would indicate a problem of this 

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)